Improvement in steam-generator grate-bars



' 1, MA'HONY.

Grate Bar.

\ No; 91,949l

Patented June 29, 41869.

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JAMES Letters Patent N 91,949, dated .Time 29, 1869.

IMPROVEMENT IN STEAM-GENERATOR @RATE-BARS.

v The Schedule referred to in these Letters Patent and making part ofthe same.

To all whom it may concern Be it known that I, JAMES MAHONY, of Newport,in the county of Newport, in the State of Rhode Island, snperintendingengineer of' the "Newport `line of Steamers between New York and Boston,have invented certain new and useful Improvements in Grate- Bars forFurnaces for Steam-Boilers and analogous situations; and I do herebydeclare that the following is a full and exact description thereof.

My invention consists in the construction of all" the severalbars orparts of the compound grate-bar, herein described, in horizontal waves,or short curves or corrugations.

.This ,construction maintains .the arrangement of the.

'lhe accompanying drawings form a part of thisA ure is applied upon anarrower section, and the gratebar is reinforced' or strengthened by adeep under-rib. Deep under-ribs are not new. Neither is the widening ornarrowingr of the sections, or the diagonal position of the cross-barsin the section. But the forming of. these several parts in short wavesis new, so far as' I am aware, and [und by practice that it ispreferable to anyother construction known to me.

Similar letters of. reference indicate corresponding parts'intlieseveral figures y A A is the exterior,- or frame of each section,and B B are diagonal lcross-bars,` cast in one with the surroundingframe A, and joined thereto `at each end. C O are projections extendingoutward, fto hold the sections at proper distances apart, to allow airto rise between them; and v t A D D are bearers extending acrossunderneath, and resting on the shelfin the side of the furnace.

In the form shown' in rigs. 3 and 4, a deeper central web orlongitudinal part is cast in with the other parts,

and is joined to the exterior frame A, and also to each of thecross-parts B, as indicated by E.

It will be observed that both the, parts A and B are formed in lshortwaves, or.-corrugations, as indicated by a. b. These are curved soshort, that a complete wave is formed in a length of bar of little morethan twice the thickness.

The top of .my sections is plane. I can slice in the ordinary manner.Iran also introduce picks, devils claws, and other cleaning-tools, inthe ordinary manner, as the waves, or short curves, by reason of theirbeing velv short and small, do not interfere with the motion ofcleaning-tools longitudinally of the slot, while they allow for theexpansion or contraction at each bend, instead of concentrating it atthe ends and middle, as when a general extended sweep is given to thebar.

I form my sections by moulding and casting from a pattern properlyformed with thel desired ,corrugations I am aware that many forms Eofgrate-bar sections have been proposed, with curves and crooks in theseveral parts. Y These I do not claim. I donot claim anything shown inthe patent of N. B. Schofield, May 1, 1866, or intlrat of J. It. Smith,November 5, 1867 the former having the corrugations only upon the lowerand thinner web of the bars, and not producing the effect of myinvention, and the. latter having the curves in large sweeps, like theletter S, concentrating the flexion at the ends. A

I am aware that many approaches have been before made to my improvedconstruction, and I do not claim any of the features separately; but

\Vhat I claim, is-

The construction ot' the rectangular corrugated frame, with corrugatedcross-bars and surrounding corrugated margin, as herein specified.

In testimony whereof, I have hereuntoset my name, in presence of twosubscribing witnesses.`

JAMES MAHONY. Witnesses: Y

- JOHN R. STANHOPE, Jr.,

JAMES Moonnxzr.

